Unlock instant, AI-driven research and patent intelligence for your innovation.

Receiver and signal received power estimation method

a technology of receiving and signal received, applied in the field of receiving devices, can solve the problems of difficulty in estimating rsrp accuracy using the method disclosed in npl3, and achieve the effects of reducing noise, improving accuracy in estimating rsrp, and increasing the number of samples to be used in in-phase addition processes

Inactive Publication Date: 2014-05-20
NEC CORP +1
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention introduces a method for improving the accuracy of estimating the arrival time of signals in a wireless communication system. By using a time-wise in-phase addition process and increasing the number of samples used for the addition, noise is mitigated and the accuracy of signal estimation is improved. Additionally, a frequency-wise averaging process is introduced to smooth the channel estimation values and reduce the amount of data that a receiver buffers. This results in reduced data buffering requirements for receivers in wide band scenarios.

Problems solved by technology

Unfortunately, in a communication method of OFDM for concurrently transmitting information by using a plurality of sub-carriers (sub-carrier waves), channel estimation values turns if an offset exists on the timing of FFT (Fast Fourier Transformation).
Meanwhile, it is difficult for the method disclosed in NPL3 to estimate RSRP with accuracy that meets those stipulated specifications.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Receiver and signal received power estimation method
  • Receiver and signal received power estimation method
  • Receiver and signal received power estimation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022]Preferred embodiments of the present invention are explained below with reference to the accompanied drawings.

[0023](Configuration Example)

[0024]FIG. 1 is a block diagram showing a configuration example of a receiver according to an embodiment of the present invention. On this occasion, explanation is made, while using LTE standardized in 3GPP as an example. Nevertheless, the present invention is not limited to LTE. Incidentally, reference signal received power to be estimated in the case of LTE is called RSRP. Then, a term “RSRP” is used in the explanation below.

[0025]A receiver 10 shown in FIG. 1 includes: an RF (Radio Frequency) unit 11, an FFT (Fast Fourier Transformation) unit 12, a channel estimation unit 13, a demodulation unit 14, a channel decoding unit 15, and an RSRP estimation unit 16.

[0026]Through a receiving antenna (not shown), the receiver 10 receives information concurrently transmitted from a base station by using a plurality of sub-carriers. The RF unit 11 a...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

In the case of a narrow band in which the number of sub-carriers to be used for the concurrent transmission is smaller than a predetermined value, an RSRP estimation unit carries out processes in an order of time-wise in-phase addition, frequency-wise averaging, and conjugate multiplication, with respect to the channel estimation values estimated by the channel estimation unit; and in the case of a wide band in which the number of sub-carriers to be used for the concurrent transmission is greater than the predetermined value, the RSRP estimation unit carries out processes in an order of frequency-wise averaging, conjugate multiplication, and time-wise in-phase addition, with respect to the channel estimation values estimated by the channel estimation unit.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]The present application is a national phase of an International application No. PCT / JP2011 / 052840 filed on Feb. 10, 2011, which relates to and claims priority from Japanese patent application No. 2010-030799 filed on Feb. 16, 2010. The contents of the International application and the Japanese application are incorporated herein by reference.TECHNICAL FIELD[0002]The present invention relates to a receiver for receiving information transmitted concurrently by using a plurality of sub-carriers (sub-carrier waves), and a method of estimating reference signal received power (RSRP), the method being used by the receiver.BACKGROUND ART[0003]An Orthogonal Frequency Division Multiplexing (OFDM) method, such as Long Term Evolution (LTE), standardized by 3rd Generation Partnership Project (3GPP) attracts attention as a communication method for the next generation. In a communication method such as LTE, a receiver needs to report reference signal re...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(United States)
IPC IPC(8): H04K1/10
CPCH04B17/0057H04B17/318
Inventor SAKAI, MASAHITOTAMURA, KOICHINGUYEN, QUANGRAO, CHAITANYA
Owner NEC CORP